Ultra-high availability level of Airlift MBR system

Date: 08/12/2019

Being the global company providing solutions for design and construction of water and wastewater plants, GES is also an O&M company having more than 100 water and wastewater treatment plants under its operation.

We in GES strongly believe that this combination grants GES’ clients with a unique added value since all the treatment plants designed by our engineering team take into account the feedback provided by our field technicians.

The symbiosis of plant design and execution abilities together with O&M expertise is of special importance in waste recovery plants featured by complex process design and harsh operating conditions. A good example of the above is our flagship project for recovering the BAZAN group industrial effluent, the largest Israeli industrial waste recovery plant.

The BAZAN plant designed by GES treats the industrial effluent by an advanced AL-MBR technology provided by PENTAIR and further deeply desalinate it by double pass RO system followed by demineralization step by EDI membranes.

Having the MBR process linked to the RO desalination is always a challenge for plant O&M team. In MBR systems, the concentration of solids inside the reactor can reach up to 15,000 ppm, therefore, even a single fiber break of MBR membranes can contaminate significantly the MBR product and make it unacceptable for further RO desalination. In case the fiber failure cannot be immediately detected and repaired, the whole relevant MBR segment have to be taken out of operation to prevent the irreversible fouling of RO membranes. As a result, the overall plant availability can be significantly lower than originally designed, especially if the MBR fibers repair process is cumbersome.

These process design considerations and O&M experience were one of the main factors leading GES to choose the advanced external AL-MBR technology in BAZAN waste recovery plant. In our AL-MBR system the single-fiber-break can be easily detected, the damaged MBR segment is immediately isolated and, most important, the damaged MBR membrane module can easily be dismantled and replaced without significant effect on overall plant availability. The following video demonstrates the process of damaged AL-MBR membrane module dismantling and replacement by GES’ O&M team. The whole process takes less than 1 hour thanks to the unique external MBR design and plant O&M team competence.